Quarterly report pursuant to Section 13 or 15(d)

Business Segments and Customer Information - Segment Information (Details)

v3.10.0.1
Business Segments and Customer Information - Segment Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Segment Reporting [Abstract]        
Number of reportable operating segments | segment     3  
Segment Reporting Information [Line Items]        
Revenues $ 168,931 $ 174,164 $ 516,222 $ 565,318
Operating income 15,697 12,237 41,145 41,438
Supply Chain Management Group        
Segment Reporting Information [Line Items]        
Revenues 51,834   161,961  
Aviation Group        
Segment Reporting Information [Line Items]        
Revenues 34,000   102,554  
Federal Services Group        
Segment Reporting Information [Line Items]        
Revenues 83,097   251,707  
Operating Segments | Supply Chain Management Group        
Segment Reporting Information [Line Items]        
Revenues 51,834 51,174 161,961 163,663
Operating income 7,783 8,178 23,547 25,611
Operating Segments | Aviation Group        
Segment Reporting Information [Line Items]        
Revenues 34,000 31,059 102,554 96,003
Operating income 2,184 1,983 7,291 6,898
Operating Segments | Federal Services Group        
Segment Reporting Information [Line Items]        
Revenues 83,097 91,931 251,707 305,652
Operating income 6,186 2,593 12,270 10,503
Corporate, Non-Segment        
Segment Reporting Information [Line Items]        
Operating income (456) $ (517) $ (1,963) $ (1,574)
Unspecified Customer One | Federal Services Group | IT service contract        
Segment Reporting Information [Line Items]        
Operating income $ 1,700